Table 1.

Composition and weight fraction of lead and lead free materials used as shield.

Material number	Material	Composition	Density (g/cm3)
1	Pb	100%Pb	11.342
2	Pb-Si	67%Pb, 33%Si	4.98
3	Pb-EPVC	87%Pb, 13%EPVC	4.745
4	W-Si	67%W, 33%Si	5.70
5	W-Sn-Ba-EPVC	52.2%W, 30.45%Sn, 4.35%Ba, 13%EPVC	4.650
6	W-Sn-Cd-EPVC (1)	36.54%W, 46.11%Sn, 4.35%Cd, 13%EPVC	4.517
7	W-Sn-Cd-EPVC (2)	34.8%W, 43.5%Sn, 8.7%Cd, 13%EPVC	4.506